again after the discharge pressure decreases to 460 psig. NOTE: When the switch opens and then closes, there will be a 3 minute short cycling delay before the outdoor unit will energize.Under normal conditions the switch is closed.

Comfort AlertTM Diagnostics Module

The Comfort AlertTM Diagnostics Module is a breakthrough innovation for troubleshooting heat pump and air conditioning system failures. The module installs easily in the electrical box of the outdoor unit near the compressor contactor. By monitoring and analyzing data from the Copeland scroll compressor and the thermostat demand, the module can accurately detect the cause of electrical and system related failures without any sensors. A fl ashing LED indicator communicates the ALERT code and a diagnostic key is also imprinted on the side of the module to quickly direct the technician to the root cause of a problem. See Figure 3.

NOTE: This module does not provide safety protection! The Comfort AlertTM Diagnostics Module is a monitoring device and cannot control or shut down other devices.

24 VAC Power Wiring

The Comfort AlertTM module requires a constant nominal 24VAC power supply.The module cannot be powered by the C terminal on a defrost board or other control board without experiencing nuisance alerts.NOTE:The wiring to the module’s R & C terminals must be routed directly from the indoor unit or thermostat.

If the constant 24 VAC (R wire) is not present in the outdoor unit, use one of the spare wires in the thermostat cable to bring power to the module. Connect the other end of the spare wire to R at the indoor unit or thermostat.

Thermostat Demand Wiring

The Comfort AlertTM module requires a thermostat demand signal to operate properly. The thermostat demand signal input (labeled Y on the module), should always be connected to the compressor contactor coil. NOTE: When the coil is energized, the demand signal input is 24 VAC.When the coil is not energized, the demand signal input should be less than 0.5 VAC.

NOTES:

•Factory installed modules have different thermostat demand signal wiring. Always follow manufacturer wiring instructions when replacing the module.

•After the thermostat demand signal is connected, verify that 24 VAC across Y & C when demand is present.

Interpreting the Diagnostic LED’s

When an abnormal system condition occurs, the Comfort AlertTM module displays the appropriate ALERT and/or TRIP LED will fl ash a number of times consecutively, pause and then repeat the process.To identify a Flash Code number, count the number of consecutive fl ashes.

Each time the module powers up, the last ALERT Flash Code that occurred prior to shut down is displayed for one minute. The module will continue to display the LED until the condition returns to normal or if 24 VAC power is removed from the module.

LED Description

•POWER LED (Green): indicates voltage is present at the power connection of the module.

•ALERT LED (Yellow): communicates an abnormal system condition through a unique fl ash code. NOTE: The ALERT LED will fl ash consecutively, pause and then repeat the process. The number of consecutive fl ashes, referred to as the Flash Code, correlates to a particular abnormal condition. Detailed descriptions of these ALERT Flash Codes are listed in Table 4 (page 14).

•TRIP LED (Red): indicates a demand signal is received from the thermostat, but current to the compressor is not detected by the module. The TRIP LED typically indicates if the compressor protector is open or the compressor has no power.

The scroll compressor’s R (run), C (common), and S (start) wires are routed through the holes in the Comfort AlertTM module marked R, C, and S.

NOTE: The common wire does not need to be routed through the module for it to operate.

POWER LED

(Green)

Diagnostics

Key

ALERT LED

(Yellow)

TRIP LED

(Red)

Figure 3. Comfort AlertTM Diagnostics

Module

10

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Nordyne R-410A user manual Comfort AlertTM Diagnostics Module, VAC Power Wiring
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R-410A specifications

Nordyne R-410A is a widely recognized refrigerant used in modern air conditioning and heat pump systems, known for its efficiency and environmentally friendly attributes. As a hydrofluorocarbon (HFC) refrigerant, R-410A has become the preferred choice for many manufacturers seeking to meet stringent environmental regulations while providing superior cooling performance.

One of the main features of R-410A is its higher energy efficiency compared to older refrigerants like R-22. This efficiency is primarily attributed to its higher pressure capabilities, which allow for improved heat transfer and reduced energy consumption in residential and commercial systems. As energy costs continue to rise, the use of R-410A in HVAC systems offers a viable solution for reducing utility bills while maintaining optimal comfort levels.

R-410A is also non-ozone-depleting, which sets it apart from many traditional refrigerants. While older refrigerants have been phased out due to their potential harm to the ozone layer, R-410A presents a sustainable alternative that aligns with environmental goals. It features a zero ozone depletion potential (ODP), making it a responsible choice for installations concerned with ecological impact.

In terms of technology, R-410A works effectively in both air conditioning and heat pump systems, providing reliable cooling in hot conditions and heat in colder months. It is compatible with a variety of system designs and can excel in both residential and commercial applications. Moreover, the thermodynamic properties of R-410A ensure consistent and reliable performance, regardless of the external temperature fluctuations.

Another characteristic of R-410A is its ability to operate at lower temperatures, which enhances its versatility. This capability allows for the design of systems that can function efficiently in a wider range of climate conditions. As a result, HVAC technicians and contractors benefit from its reliability and performance, leading to less frequent maintenance and enhanced customer satisfaction.

Lastly, R-410A systems are equipped with advanced components that improve overall functionality. These systems often include variable-speed compressors, which optimize energy use based on cooling demand, and advanced refrigerant management technologies that ensure safe and efficient operation.

In conclusion, Nordyne R-410A stands out as a superior refrigerant due to its energy efficiency, environmental benefits, and adaptability across a range of HVAC applications. As the industry continues to innovate and shift toward sustainable solutions, R-410A remains at the forefront of refrigerant technology, ensuring homeowners and businesses alike enjoy efficient and eco-friendly cooling options.
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